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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Isachne guangxiensis

HABIT Perennial. Culms geniculately ascending; slender; 20–40 cm long; rooting from lower nodes. Culm-internodes distally glabrous. Culm-nodes swollen; bearded. Lateral branches lacking. Leaf-sheaths longer than adjacent culm internode; glabrous on surface; outer margin hairy. Leaf-sheath oral hairs ciliate. Ligule a fringe of hairs; 2 mm long. Leaf-blades linear, or lanceolate; 5–9 cm long; 6–8 mm wide. Leaf-blade surface scabrous; rough abaxially. Leaf-blade margins cartilaginous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 7–10 cm long; 3–5 cm wide. Primary panicle branches ascending; 1 -nate. Panicle axis glandular. Panicle branches glandular.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; 1 length of fertile spikelet; glandular.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets, or 2 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 1.5–1.8 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes deciduous; similar; reaching apex of florets; thinner than fertile lemma. Lower glume elliptic, or ovate; 1.5–1.8 mm long; 1.1 length of spikelet; membranous; without keels; 7–9 -veined. Lower glume lateral veins obscure. Lower glume surface pubescent; hairy above. Lower glume apex acute, or acuminate. Upper glume elliptic, or ovate; 1.5–1.8 mm long; 1.1 length of spikelet; membranous; without keels; 7–9 -veined. Upper glume lateral veins obscure. Upper glume surface pubescent; hairy above. Upper glume apex acute, or acuminate.

FLORETS Basal sterile florets when present male. Lemma of lower sterile floret similar to fertile lemma. Fertile lemma orbicular; 1.4 mm long; cartilaginous; without keel. Lemma margins involute. Lemma apex obtuse. Palea cartilaginous.

FLOWER Lodicules 1; 0.3 mm long. Anthers 3.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 1.2 mm long; dark brown.

DISTRIBUTION Asia-temperate: China.

NOTES Isachneae. Fang 1996.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.